Furnace doorframe



Nov. 8, 1938.

L. R.4 MCAFOOS FURNACE DOORFRAME Filed oct. 15;l 19:57

Patented Nov. 8, 1938 UNITED STATES PATENT OFFICE FURNACE DOORFRAMEApplication October 15, 1937, Serial No. 169,118

9 Claims.

My invention relates in general to furnace door frames and moreparticularly to water-cooled furnace door frames of the characteremployed in open hearth furnaces and the like.

The present invention represents an improvement over the invention shownand described in my United States Letters Patent No. 1,935,853, issuedNovember 21, 1933. In the structure illustrated in that patent, there isa skeleton frame having two open spaces BV above the furnace dooropening A, two uid inlets and one fluid outlet. In some installations itis preferred to cool the whole structure, and the door frame shown in mysaid patent is not as suitable for some installations as the presentinvention herein described.

In the accompanying drawing, which illustrates the present preferredembodiment of my invention:

Figure 1 is a front elevation of the frame;

Figure 2 is a Vertical section on the line II--II of Figure l, lookingin the direction of arrows; and

Figure 3 is a horizontal section on the line III- III of Figure l,looking in the direction of the arrows.

In the drawing there is shown a water-cooled door frame which has a bodyportion 3 forming the top of the frame, and side members or legs 4 and 5extending along the sides of the body portion 3 and downwardly therefromto the bottom of the furnace door opening A. Each of the legs 4 and 5has projecting therefrom and at right angles thereto wing plates l and8, respectively. These wing plates bear against the furnace walls (notshown) when the door frame is in yposition in the furnace structure.

The side or leg members 4 and 5 are preferably formed from sheet metalbent as shown in Figure 3 and welded at 9 to form an enclosed waterpassage. Each of the legs has a re-entrant portion I to provide guidemeans for a door II, a part of which is shown in dotted lines in Figure3. I prefer to iorm the wing plates l' and 3 integral with the outsideedge of the leg, although the wing plate may be separately formed andattached. Secured to the lower portion of leg member is a U-shaped orchannel member or conduit I2 which extends up along the leg l as shown,across the lower portion of body portion 3 forming a lintel I3 andthence downwardly along the other leg 5. The sides of conduit I2 aresecured to the legs I and 5 as by welding to form a water-tight joint.The lower ends of legs 4 and and associated conduit I2 are closed byplates I 6 and I5, welded or otherwise secured in position. Washoutplugs I6 and il are located adjacent the lower ends of the legs 4 and 5,respectively. Between the lower ends of leg 4 and member I2 an openingI8 is provided; likewise an opening i 9 is provided between the lowerends of the leg 5 and member I2.

A plate '23' is prcvided to cover the lintel portion of the conduit I2.This plate extends from a point adjacent the side of leg 4 andterminates in an upturned portion just short of the center line of thestructure. A similar plate ZI extends from just beyond the centerl lineto a point adjacent the leg 5. This construction provides openings 22,23 and 24 leading from the conduit I2 into the enclosed bcdy portion 3.If desired, openings may be formed in plates 2t and 2l at suitableintervals.

The body portion is enclosed by plates 25 and 23, welded to the legs 4and-5 and to the conduit I2. The upper portions of the leg members andbody portion 3 are closed by a plate 21. An inlet pipe 28 isprovided'through plate 2 into a chamber 29 formed in the upper part ofleg It by plate 3l). The plate 3i) has an opening '3l leading into theleg member. Similarly the outlet pipe 32 passes through the plate 2l andinto chamber 33 formed in the top of leg 5 by the plate 34. Plate 35has-a small hole 35 therein to permit the escape of any vapors or steamwhich may collect in leg 5 but it is not suicient in size to allow anysubstantial amount of water to pass through. The chamber 33 is connectedto the hollow body portion 3 by means of an opening 36 in the sidewallof the leg 5. Leading from inlet chamber '29 is a pipe 3l which extendsdiagonally and downwardly through body portion 3 and is connected at 38to leg 5.

As indicated by the arrows in Figure 1, the water circulation is asfollows. Water or other cooling medium is introduced through inlet pipe28 into chamber 29y from whence some of the :duid passes downwardlythrough leg 4 through opening i8 land up conduit I2 lthrough passages 22and 23 and into body portion 3. The rest of the water from chamber 29passes through pipe 3l into leg 5 and from thence through kpassages I9and conduit I2, through the passages 24 and 23 into the body portion 3.A comparatively small amount passes through opening 35 into outletchamber 33. The water from the body portion 3 finally passes throughopening 35 into chamber v33 and is discharged through the outlet 32.

It is apparent that I have provided a structure which is relativelyinexpensive to yconstruct and one which be expeditiously andeconomically repaired, should the occasion arise. The amount of weldingin the structure, of the character I have shown, is reduced to a minimumand there is a positive water circulation throughout all the structureand no dead pockets can form in which scale and dirt will be lodged, thepresence of which would result in rapid deterioration of adjacent parts.

While I have illustrated and described the leg, a conduit extendingalong part of the legs and comprising a hollow body portion at the topof the 1. A hollow water-cooled furnace door frame comprising a hollowbody portion at the'top of the frame, two hollow legs forming the sidesof the frame, a conduit extending along part of the legs and betweenthem to form the bottom of the body portion, an opening from each ofsaid legs to said conduit adjacent the lowermost ends of the legs, anopening from said conduit to the body portion at the latters lowermostportions, an opening from the conduit to the body portion adjacent thelower center portion of the body portion, a fluid inlet connected to oneleg and a fluid outlet connected to the body portion.

2. A hollow water-cooled furnace door frame comprising a hollow bodyportion at the top of the frame, two hollow legs forming the sides ofthe frame, a pipe connecting the legs through the body portion, aconduit extending along part of the legs and between them to form thebottom of the body portion, an opening from each of said legs to saidconduit adjacent the lowermost ends of the legs, an opening from saidconduit to the body portion at the latters lowermost portions, anopening from the conduit to the body portion, adjacent the lower centerportion of the body portion, a uid inlet connected to one leg and afluid outlet connected to the body portion.

3. A hollow water-cooled furnace door frame comprising a hollow bodyportion at the top of the frame, two hollow legs forming the sides ofthe frame, a perforate plate near the upper part of one leg andextending across it to form a chamber, a fluid inlet pipe connected tothe chamber, a pipe extending from the chamber to the other between themto form the bottomof the body portion, an opening from each of said legsto said conduit adjacent the lowermost ends of the legs, an opening fromsaid conduit to the body portion at the latters lowermost portions, anopening from the conduit to the body portion adjacent the lower centerportion of the` body portion, and a fluid outlet connected to the bodyportion.

4. A hollow water-cooled furnace door frame frame, two hollow legsforming the sides of the frame, a perforate plate near the upper part ofone leg and extending across it to form a chamber, a fluid inlet pipeconnected to the chamber, a pipe extending from the chamber to the otherleg, a conduit extending along part of the legs and between them to formthe bottom of the body portion, an opening from each of said legs tosaid conduit adjacent the lowermost ends of the legs, an opening fromsaid conduit to the body portion at the latters lowermost portions, anopening from the conduit to the body portion adjacent the lower centerportion of the body portion, and a discharge outlet connected to the'upper end of the body portion.

5. A hollow water-cooled furnace door frame comprising a hollow bodyportion at the top of the frame, two hollow legs forming the sides ofthe frame, a pipe connecting the legs through the body portion, aconduit extending along part of the legs and between them to form thebottom of the body portion, an opening from each of said legs to saidconduit adjacent the lowermost ends of the legs, an opening from saidconduit to the body portion at the latters lowermost portions, anopening from the conduit to the body portion adjacent the lower centerportion of the body portion, an outlet chamber in the top of one leg andseparated therefrom by a plate, an opening from the body portion to theoutlet chamber and a fluid outlet passage connected to the outletchamber.

, 6. A hollow water-cooled furnace door frame comprising a hollow bodyportion at the top of the frame, two hollow legs forming the sides ofthe frame, a pipe connecting the legs through the body portion, aconduit extending along part of the legs and between them to form thebottom of the body portion, an opening from each of said legs to saidconduit adjacent the lowermost ends of the legs, an opening from saidconduit to the body portion at the latters lowermost portions, anopening from the conduit to the body portion adjacent the lower centerportion of the body portion, an outlet chamber in the top of one leg andseparated therefrom by a plate, a vent in the plate, an opening from thebody portion to the outlet chamber and a fluid outlet passage connectedto the outlet chamber.

'7. A hollow water-cooled furnace door frame comprising a hollow bodyportion at 'the top of the frame, two hollow legs forming the sides ofthe frame, a UV-shaped open sided conduit extending along the lower partof each leg and secured thereto in such a manner that one side of theleg closes the open side of the conduit adjacent thereto, said conduitextending across the lower part of the body portion to form a lintel, aplate closing the open side of the conduit between the legs,

Vsaid plate having openings therein extending from the conduit to thebody portion, an opening from the bottom of each of said legs to saidconduit, a fluid inlet connected to one leg and a fluid outlet connectedto the body portion.

8. In a water cooled furnace door frame, spaced apart hollow legsextending from the top tothe bottom'of the frame, a conduit extendingalong part of the legs and between them to form a lintel, an openingfrom each of said legs to said conduit adjacent the lowermost ends ofthe legs, a hollow body portion between said legs and extending from thetop of the frame to the lintel,

said conduit having openings from the lintel portion extending to thehollow body portion, a fluid inlet at the top of one of said legs and afluid outlet connected to the hollow body portion adjacent the top ofthe other leg.

9. v In a water cooled furnace door frame, spaced apart hollow legsextending from the top to the bottom of the frame, a conduit extendingalong part of the legs and between them to form a lintel, an openingfrom each of said legs to said conduit adjacent the lowermost ends ofthe legs, a hollow body .portion between said legs and extending fromthe top of the frame to the lintel, said conduit having openings fromthe lintel portion extending to the hollow body portion, a pipeconnecting the legs and extending through the body portion, a fluidinlet connected to the top of one leg and an outlet chamber in the topof the other leg, said chamber being connected to the top portion ofthehollow body portion and to a fluid outlet.

LAWRENCE R. MCAFOOS.

